evil QtBug: QML "external Drag and Drop" unusable in Ubuntu.

actually i suffer the following, very evil Qt-bug:
The new external Drag and Drop feature is absolutely unusable in Ubuntu/Kubuntu!
The bug is reported here: https://bugreports.qt.io/browse/QTBUG-41756
Even the example, shipped with QtCreator, doesn't work at all. Does anybody have a workaround / alternative implementation? Can anybody please check in which platforms this bug doesn't appear?
I was able to test it with Ubuntu, Kubuntu and OS-X. OS-X was the only platform, where the "external Drag and Drop" example worked correctly. In which platforms else?